CD69 and acute lymphoblastic leukemia: As observed with PMA, activation of the leukemic T-cell lines with 100 nM to 800 nM of the calcium ionophore A23187 for 24 h induced the expression of CD69 on EL-4, BW5147, L1210, and Jurkat cells and also, to a lesser extent, on HPB-ALL cells (Table 1).